Pressure-controlling device



J. BUCHEL.

PRESSURE CONTROLLING DEVICE.

APPLiCATlON' FILED MAY 28. 1917.

Patented May 27, 1919.

2 SHEETS-SHEET l.

' nvuwrm? s arr? WITNESS;

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J. BUCHEL.

PRESSURE CONTROHQING DEVICE.

APPLICATION FILED MAY 28, 1911.

1,305,059, I Patented May 27, 1919.

2 SHEETS-SHEET 2.

INVEMTJR W 5 WITNESS.

. ENE FFEQ.

JULES BUGHEL, OF NEW ORLEANS, LOUISIANA, ASSIGNOR T0 WILLIAM J. KELLY, 0F HAVERFORD, PENNSYLVANIA.

PRESSURE-CONTROLLING DEVICE.

Specification ofLetters Patent.

Patented May 2'7, 1919.

Application filed May 28, 1917. Serial No. 171,388.

zen of the United States of America, residing in New Orleans, in the parish of Orleans, in the State of Louisiana, have invented. certain new and useful Improvements in Pressure-Controlling Devices, of which the following is a true and exact description, reference being had to the accompanying draw ings, which form a part thereof.

My present invention consists in novel means for interrupting the fiow of a fluid through a conduit in response to a predetermined variation in the pressure of another fluid not passing through the conduit, and the general object of my invention is to provide simple and effective means for the pur pose specified.

The various features of novelty which characterize my invention are pointed out with particularity in the claims annexed hereto and forming a part of this specification; for a better understanding of the invention, however, and of its advantages and specific objects attained, reference should be had to the accompanying specifications and drawings in which I have illustrated a preferred embodiment of my invention.

Of the drawings Figure 1 is an elevation of the apparatus with the front cover plate removed. Fig. 2 is a section taken on the lines 2-2 of Fig. 1. Fig. 3 is a rear elevation with parts in section on the broken line 33 ,of Flg. 2. Fig. 4 is a section on the line H of Fig; 3, and Fig. 5 is'a section taken on the line 5-5 of Fig. 1.

The apparatus, in the preferred form illustrated on the drawings, comprises a main casing member A, formed with a cylindrical chamber A, open at one end, and with an upper inlet A and a lower'outlet A. The inlet A is internally threaded to receive a standard pipe connection, and the outlet A is externally threaded to receive a pipe fitting part A. Between the end .of the outlet A and the fitting A is secured a washer O, which serves as a gasketrto make a tight joint between these parts andalso as a valve seat member. The open end of the chamher A is normally closed by a front cover plate B, which is secured in place by bolts B.

A stud or post D, advantageously formed of steel and provided with a flanged base,

is located within a chamber A, and is secured against the rear wall of the chamber by screws D. This stud is provided with a portion D projecting through an aperture formed for the'purpose in the rear wall of the chamber. The external end of the portion D is externally threaded to receive a pipe connection. Located side by side within the chamber A are a pair of curved tubes E and F, each of which is soldered or other wise suitably secured at one end to the stud D. The latter is formed with a passage D which communicates at its inner end with the interior of the tube E and has its outer end axially disposed in the threaded portion D of the stud. The stud D is also formed with a passage D open to the atmosphere at its outer end, and communicating at its inner end with the interior of the tube F.

The end of the tube F remote from the stud D is soldered, or otherwise secured, to an end member F, which closes the end of the tube passage and is provided with bracket ears between which one end of an arm or connecting rod G is journaled on a pivot pin F The other end of the arm G is pivotally connected to the lower end of a swinging link H, which has its upper end journaled on a stud I secured to the rear wall of the casing A. To permit of an adjustment of the distance between the lower end of the link H and the end member F the connection between the link H and arm G is formed by means of a member H which is rotatably mounted in a split collar formed at the end of the arm G. The member H may be clamped in any desired angular relation with the member G by means of the clamping screw G connecting the lugs G formed at the ends of the split collar. The member H is formed with an eccentrically disposed aperture forming the bearing for a pivot stud H, carried by the link H. For added security the member may be externally threaded and the collar receiving it is then correspondingly threaded internally.

The end of the curved tube E, remote from the stud D, is provided with an end member E (see Fig.3) similar to the end member F. A pivot pin E pivotally connects the end member E to one end of a trip arm J. The opposite endJ' of the arm J normally rests upon the flat upperside of a lug arm J adjacent the end J of the latter. The. lower end of the linker connecting rod K is pivotally connected by the pivot pin K" to the upper end of a valve member L, which,

works freely in the outlet passage A and does not fill the latter. The lower portion L 'of' the valve member L is made conical. When the end J of the ,libeih i on they lug H the valve member L does not obstruoththe. flOWu ,out' of the chamber A througlr .the outlet passage: A and; the: hollow-fitting Atbut'wheni the armJ and lug H disengage, as) hereinafter. explained, the valve member =L.. drops into. the a position; into which itwengages the. valve seat. member C and closes thepassage thnough:the, latter, which, as well. as, the. passage through the fittingAt, is smaller-in diameter thaln the large diameter. portioniofithe. valve L. The upper. portion of the valvemember; L. is..pro videdtwith. centering :lugs. L which tend to hold-the-valve member. .centralz with respect to the outlet. passage lA With. thenconstructiomdescribed an increase in:..pr.essuI '.e; within thetube 13 tends to straightenetube E a-11d thereby move the end member:E awaylfrom'the armlH, and when the increase. ofpressure reaches the amount forewhichzthe apparatus isset to respond the, endiJfi of the arm. J' is moved off they-lugandnthe valve 'member 1L drops into engagement with the, valve seat member C and; closes. the outlet.v from the-chamber A... A-variation. inwthe pressure within thefchamber A? does-not. disturb thegrelative posit-ioniof'thesend J of the arm J- and the lug I r,..however;, since theitwontubes E and F are straightened or fleXed-inthesameway and to the. same amount by. an increase or decrease of -pressure inthefchambeiwA regardless of what. the. internal pressures in thetubes E and: F may-be. When the two tubes E and'Ftare similarly straightened or flexed the end J5 andthe-arinJ and the lug H are-given similar:movementsL Theqapparatusin the-formtshownin the e drawings, was. especially devised: for use 1n refrigerating apparatus in-v which the I fluid passing through the chamber A is steam at airelatively highpressurasay 200 lbs. or so, and thefluidadmittedz'tov the interior-of the .-tube.E isammonia. For such .usethevalve .non-corrodibl; material, such as aluminum bronze, WlflilG 'thG .remainder of' the apparatus, with. the exception ofthe valve seat member G, may be'. made'.- of-ziron2 and steel. The. valve.-sea.t-:: member G; may Y advantageouslyibe-made-ioii Babbitt metal; or copper,

and is preferably formed with a sharp corner at the edge engaged by the valve L, so

that the slight deformation occurring when the valve seats, and the relatively small areas of contact will minimize the possibility of leakage.

To adjust the member H in its seat and thereby vary the pressure at which the valve trips it is necessary to remove the cover plate B; To open the valve and reset-the mechanism, afterthevalve has tripped, 'it is necessary to remove the cover plate B, or to remove the fitting-Aflor Some'fittingmember connected thereto,,.. and. thereby. making it possible. to. engage the lower end Qfi the. valve 'anflzforce it upwarduntil the-end J.: of the arm Jcams the lug: Hito. one; sideandthen.

passes above thelatter.. Thesfactrthat the adjustment. of .the. mechanism ad the:- re- 7 setting, of the valve. are not. particularly-easy of accomplishment with, the form .of construction shown .is an, advantage-rather than;

otherwise,- in .view. .ofthe fact that theidevice is. intended. for use as. asafety. device, which ordinarily. will. trip only; at; infrequent. intervals, and which; ShQQld 1.equl I8 adjustment under ordinary. conditions only: in, rareinstances and. should not be. adjusted. except y authorized-pe sons.

While the valve will ordinaniflynottrip and close except atrare intenvals, the various moving-partswill be almost continually.

i.n-=motion. because =.ofvariations. in temperature'andpressur'e constantly occurring. in practice, and this; is a decided advantage-in that it keeps-the variousebearing and; trip contact. surfaces clean, and prevents; them -fr.eez-ing?-' together under the; corrosive: :influenceto which they are subjected. While the effect of corrosion; on-thev steel tubes E a'ndF will tendto weaken.the;tubesyin time,

this weakening of; .the'tubesimnowise im-e pairs the capacity of the apparatusto operate as asafety device. The-onlyeftectof the tube weakeningisito lower themaximum ammonia pressure. in. the. tube E required ;to' trip; the valve. The i avoidance 'ofstufling bojxes'is of especial importance in apparatus for handling ammonia under pressure. Under certain-conditions of use as in: refrigerating apparatusdn which kerosene; or like fuel oil is passedithrough the chamber the. pressure of; thefiuid passing through the chamben A. may be small in comparisonwith-the pressurein the. tube E. In such cases it im'ayibe advantageol-ls to simpl-i fy= the apparatus-disclosed by eliminating;

the, provisions. made for compensating for variationsin pressure within. the chamber A". This simplification -1nay be-Ve'fi'ecte'd, with the particular. apparatusdisclosed, by

simply. removing the; arm; G and tube -F and closing up the passage D WVith: these partsremoved the ug shou mheheld. stati.onary: -,an.d thisx-may beaccomplished, for

example, by tightening the nut I on the stud 1, so as to clamp the hub of thelink H rigidly to the casing A in the desired adjustment of the link." 1 i While in accordance with the provision of the statutes I have illustrated and described the best form of my invention now known to me, those skilled in the art will understand that changes may be made in the-form of the apparatus disclosed without departing from the spirit of the invention claimed herein, and certain features of my invention may some time be used to advantage without a corresponding use of other features.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. The combination of a chambered valve casing, a valve in said casing controlling fluid flow therethrough, and means releasably holding said valve in one position comprising a hollow element adapted to expand and contract on variations in the difi'erential of the internal and external pressures to which it is subjected and provisions for connecting the interior of said element to a source of pressure external to said casing, and means for neutralizing the effect on said valve holding means of a variation in the pressure acting externally on said element.

2. The combination with a chambered valve casing of a valve in said casing controlling the flow therethrough, a pair of cooperating latching parts normally in engagement and holding said valve in one position, pressure responsive elements connected to said parts and adapted to giving similar movements to said parts on variations in the pressure in said casing, and provisions for subjecting one of said elements to a source of pressure external to said casing whereby said latching parts will disengage on a predetermined variation of the last mentioned force, but will not disengage on variations of the pressure in said casing.

3. In combination a valve casing formed with a fluid thoroughfare and with a passage through its wall, a valve in said casing controlling the flow through said thoroughfare and means for releasably holding said valve in one position comprising a curved tube, closed at one end and having its opposite end connected to the casing, and communicating with said passage through its wall, and a pair of cooperating latching parts one of which is connected to said tube.

4. In combination a valve casing, formed with a thoroughfare for fluid and with two passages in its wall opening at the outer side of the casing, a valve controlling the flow through said thoroughfare, and means for releasably holding said valve in one position comprising a pair of curved tubes located in said casing, and each closed at one end and having its opposite end connected &

to the casing and communicating with a corresponding one of said passages, and a pair of cooperating latching parts, one connected to one and the other to the second of said tubes. r

5. In combination a valve casing formed with an aperture in its wall, a valve located in said casing and means for releasably holding said valve in one position comprising a support projecting through and closing said aperture, a pair of curved tubes each closed at one end and having its opposite end secured to said support, and a pair of cooperating latching parts connected one to one and the other to the second of said tubes, said support being formed with two passages leading through the wall of the casing, and each communicating at its inner end with the interior of one of the tubes.

6. In combination, a chambered valve casing, a valve in said casing controlling flow therethrough, cooperating latching parts in said casing normally in engagement and holding said valve in one position, means for disengaging said parts comprising a hollow element connected to one of said parts and adapted to move the latter on variations in the difference between the pressures acting internally and externally on said element, provisions for connecting the interior of said element to a source of pressure external to said casing, and provisions for varying the normal relative arrangement of said latching parts and ele ment.

7 In combination, a valve casing formed with a thoroughfare for fluid and with two passages in its wall opening at the outer side of the casing, a valve controlling the flow through said thoroughfare, means for releasably holding said valve in one position comprising a pair of curved tubes located in said casing, and each closed at one end and having its opposite end connected to the easing and communicating with a corresponding one of said passages, a latching part connected to one of said tubes, and a cooperating latching part adjustably connected to the second of said tubes.

8. In combination, a valve casing formed with a thoroughfare for fluid and with two passages in its wall opening at the outer side of the casing, a valve controlling the flow through said thoroughfare, means for releasably holding said valve in one position comprising a pair of curved tubes located in said casing, and each closed at one end and having its opposite end connected to the cas ing and communicating with a corresponding one of said passages, a linked structure comprising a pair of links pivotally connected to each other and one pivotally connected to said casin and the other to the closed end of one 0 said tubes, a latching part carried by said structure, and a cooperating latching pant connectegh tax-the closed ends. of the; secpnd tube:

9.1 In combinabionea valveeasingifolmed wibhzaathomughfmsel fen fiuid-andiWithwbw0 passages in its well opening at the- 01mm: side of. the easing, -v-aLve; cOnt-mlling the. flow l thmug-h 'said thovou'ghfane; means -=f0n releasably 'h01d-ing;saidvalve in-onez position comprising-1. a: painof curved tubes l'ocatedrin 10 said casing; and -Ieachmlosed at; onerendrsa-nd having! its opposite endconnected toithezcasingqaand l communicatingiwithi a comes-pond- Obnies of: thi mpatcnt max 'rbe obt 8ined-: for

ed rtoiaeach othelz'andione pivotally connected to said casing and the othenteztheaclosed end offi one= ofisaidttiliegzaalabching pant: carried by-saidw structuneyendi a eopemti-ngflatchinglpam c0nne0tedut0' -the:1'closed endw of the second tube; FSflid'i linkeda 'sfinncture' 'lqeing adj ustable to valgm the nomnal LeIat1Ve posltionssofiisaidi'latchingvapartsz lUIzES BHCHEE; 

